Oil burner and motor unit



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April 22, 1941. E L. WOOD OIL BURNER AND MOTOR UNIT Filed Aug. ll, 1937 2 Sheets-Sheet 2 /N VENTO/e yn/dra? /4/00a7.

Patented Apr. 22,

on. BURNER AND Moron UNIT Edward L. Wood, Detroit, Mich., 4assigner to Gar Wood Industries, Inc., Detroit, Mich., a corporation of Michigan applicati@ August 11, 1937, serial No. 4158,560

(ci. 15s-17) 2 Claims.

My invention relates to oil burners, and particularly to a unit burner having a motor upon which the burner elements are retained in axial alignment with the motor shaft.

The main objects of my invention are to provide a burner unit with resilient mounting means which frictionally supports the unit on an air conditioning device; to provide a unit embodying a motor having a pump, air propelling means, and nozzle forming a unit which is resiliently and releasably mounted by the supporting means of the motor; to provide a motor with a pump, both of which have co-axial hollow shafts which terminate in a low pressure side of the pump; to join the terminal ends of a pump and motor which are disposed in the low pressure side of the pump with a connector which forms a conductor and a driving means between the shafts; to provide a nozzle having a hollow shaft with radially disposedpassageways for the liquid which is delivered to a chamber in the end of the nozzle to rotate in the direction of the rotation of the shaft; to provide a heating device with a cylindrical element for frictionally receiving the burner unit which forms a seal therewith; and in general, to provide a unit burner which is rugged in construction, positive in operation, and economical of manufacture.

Other objects and features of novelty of my invention will be eithery specifically pointed out or .Y

will become apparent when referring, for a bet'- ter understanding of my invention /to the following description taken in conjunction with the accompanying drawings, wherein:

Figure 1 is a sectional view of an oil burner unit Y embodying features of my invention;

Fig. 2 is a reduced sectional view of the structure villustrated in Fig. 1, taken on the line 2-2 thereof;

Fig. 3 is a sectional view of the structure illustrated in Fig. 1, taken on the line 3-3 thereof;

Fig. 4 is an enlarged sectional view of the nozzle illustrated in Fig. 1; Fig. 5 is an enlarged sectional view of the structure illustrated in Fig. 4, taken on the line 5-5 thereof;

Fig. 6 is a broken view of a pump unit similar to that illustrated in Fig. 1, showing a modified form thereof; and, Y

Fig. 7 is an enlarged broken view of the centrifugal switch illustrated in Fig. 1.

Referring more particularly to Fig. 1, I have illustrated the unit oil burner as being mounted in a tubular element I0 which projects through the casing II of the conditioning unit and wall I2 of a heating chamber. The cylindrical element is preferably welded to the furnace or conditioning unit, and it is to be understood that the element is a necessary part of the burner unit and can be employed separately therewith. A collar I4 is welded or otherwise secured on the inner surface of the element I0 near the inner end thereof and forms an abutment for an air deecting element I5 which is retained in fixed abutted position by a plurality of bolts IG. The air deflecting element has a tapered Wall terminating in a cylindrical neck I1 which receives an annular ring I8 of a triangular section to further control the flow of air across the nozzle of the burner. The ring I8 is slotted at 20 at the bottom as illustrated in Fig. 1, and is provided With a sloping entrance surface I9 by which it maybe readily forced into the neck I1 of the air deflector element. A sector 2I is Welded or otherwise secured at the rear lower end of the neck I1 to form a wall for trapping any oil which may drip from the nozzle of the burner and which may pass from the slot 22 in the ring I8.

The burner unit is completely demountable and slides within the cylindrical element I0 to frictionally engage the wall thereof at spaced points to provide a. support for the unit. In this construction the unit 23 may be bodily removed from the element II) by removing a cap 24 and disconnecting the supply and return conduits 25 and 2E. The unit is retained in position by the frictional engagement of the supporting elements with the Wall, which elements are resilient and sound insulating.

'Ihe unit comprises a motor 2l, a liquid pump 28, a fan 29, and a nozzle 3l. On the rear bracket of the motor a plurality of rubber supporting lingers 32 are provided of such length as to env gage the element I8 under compression to there- `by resiliently support the rear end of the unit.

A guard or auxiliary support 33 may be provided adjacent to the lower or all of the fingers to form a seal with the element III and a further support for the unit. It will thus be seen that the unit is floated upon the ring 31 and the fingers 32 and retained in position by the frictional engagement thereof with the wall of the element I0.

On the rear bracket of the motor 21, the pump 28 is securedy to form a unit therewith. Any suitable pump28 may be employed, theone herein illustrated being providedwith the usual gears 38 having the driving shaft 39 thereof disposed .in extension of the hollow shaft 4| of the motor 23. The ends of the shafts abut within the low pressure chamber 46 of the pump and thereby eliminates the hazard of leaksbetween the shafts. A sealed drive connection is provided between the shafts by a tube 42 having caps 43 threaded on each of its ends for drawing resilient Washers 44 against the shafts when the caps are tightened upon the tube. A seal 45 within the low pressure chamber 46 seals the motor shaft Within the low pressure chamber 46 of the pump. Fluid is drawn through the conduit 25 when the gears 38 are operated and is forced through the regulating valve 30, the hollow shaft 20 into the opening 41 and the end of the shaft 39. Any fluid which may leak past the valve or be by-passed thereabout, Will return to the supply source through the conduit 26.

Referring to Fig. 6, I have illustrated a modined form of pump whereinV the pressure on the shaft is balanced. In the structure of Fig. l, the fluid was conducted from the regulating valve 38 through the idler gear shaft to a slot which communicated with the end of the driven gear shaft. In the present arrangement the fluid from the regulating valve passes through the aperture 40 to an annular groove 58 in the shaft which communicates with the opening in the shaft. The rearr end of the shaft is closed and the pressure therewithin is balanced, eliminating the necessity of employing thrust washers which are subjected to extreme Wear.

n the opposite end of the shaft 4| a hollow hub I of the air propelling element 29 is threaded or otherwise secured. The element 29 is provided with a plurality of blades 52 supported by a plate 55, the end portions 53 of the blades being disposed at an angle,V as illustrated more clearly in Fig. 3. Airis drawn through an opening 54 in the ring 35, moved along the blades 52 and plate 55, propelled along the wall of the air deflector element I5 and ejected from the end of the neck I1. 4

Referring `more particularly to Figs. 1 andA '7, I have illustrated the centrifugally actuated valve as being mounted in the nozzle 3| and hub 5| of the air propelling means 29. The valve embodies supports the arm 59 adjacent tothe pivotal connection of the rod 65 therewith. The distance of the spring 62 from the pivot 60 is greater than the distance of the rod 65 therefrom so that the moment of thev spring is sufficient to produce a snap action to the valve to provide instantaneous closing as soon as the speed of the motor is re,

duced. The valve is loosely guided by the free end of the rod and the valve portion 63 is selfcentering on the seat 64 irrespective of the degree of tilt of the rod 65.

At the base of the hub 5I a shouldered washer 66 is secured. The washer has a central opening covered by a screen 61 disposed in the path of the fuel from the pump 28. Any particles caught by the screen will be moved by centrifugal action toward the outer periphery of the Washer which forms a catch basin therefor.

The arm 59 may be provided with a threaded aperture 51 and the weight 6| is preferably of lead or similar soft material which is bent in U-shape and pressed onto the arm with sufficient force to have the material flow into the threaded aperture to thereby retain the weight in firm fixed relation to the arm.

Over the outer end of the cylindrical element I0 a casing 24 is secured having a slotted end 66, with brackets 69 disposed at each side through which clampingrbolts 13 extend to vdraw the brackets together and retain the cap in position. The conductors 25 and 26 extend `through the opening 14 formed by the slot in the cap through'Y which the air required for combustion is drawn by the air propelling element 29. A `shutter 15 is secured adjacent the opening by a bolt 16 adjustable in a slot 11 in the cap 24. By shifting the shutter 15 a proper regulation may be had for the have illustrated the nozzle 3| as embodying a conductor 9|, having a cap 92 threaded in its outer end. The cap supports a sealing element 93, having a frusto-conical head 94 and a recessed portion forming a chamber 95. The head 94 forms a seal with the wall of a similarly'shaped recess within the cap 92. Slots 96 are formed in the head 94 disposed tangentially of the head' las illustrated in Fig. 5. The ends of the slots communicate with a chamber 91 in the end of the cap which is extended to form an arcuate delivery passage 98, the curvature of which controls the included angle of the conical shaped spray of fluid delivered from the nozzle end. A passage 99 extends through the element 93 communicating with the chamber Within the cap.

A thimble IUI is screwed within the end of the cap 92 having openings |02 in its wall and provided with a shoulder |03 on its lower end. An annular screen |84 is mounted on the thimble IDI in a position to be engaged by the cap 92 and the shoulder |03 when the thimble IUI is threaded into the cap. A further seal for the fluid is thereby provided in the nozzle to thereby elimiwhich the end of the rod 65 projects. A pivot 68 .than When forming a direct passage.

nate any possibility of stoppage in the fluid passages. The slots 96 control the flow of fluid under pressure from the nozzle andwhen disposed in the manner illustrated can be made larger The fluid is introduced under pressure, which may be as high as 100 pounds per square inch, and is swirled within the chamber 91 as it is propelled from the end of the passage 98. The frictional resistance which is sei:l up by the wall of the opening is reduced materially through the rotation of the shaft in-Y the direction of the flow of fluid and it was found that a more turbulent mixture Wasob'- tained which broke down the fluid into smaller globules. These are ejected from the passage 9B in a very ne spray in the shape of a cone, the included angle of which is regulated by the degree of arc provided at the mouth of the` passage. The terminal ends of the electrodes are disposed within the cone of spray and assurance is always had that ignition will occur when the burner is operated. The ring i8 provided in the neck l1, directs the propelled air across the-conical spray to uniformly mingle with the small uid globules and provide a mixture which is readily combustible.

The unit thus formed is self-contained and is releasably and resiliently mounted and sealed within the cylinder element l0 which forms a part of the device. Connections are made through conductors 25 and 2E which project through the opening 'I4 in the end cap 24. It is only necessary to remove the cap and disconnect the conductors to have the unit free to be removed by withdrawing it from the cylindrical element. The unit thus removed may be repaired, or a repair unit may be immediately installed in place of the defective unit. It is to be understood that the motor and pump forms a unit which may be employed for other purposes where a hollow rotating shaft for delivering fluid can be utilized.

While I have described and illustrated but a single embodiment of my invention, it will be ap parent t0 those skilled in the art that various changes, omissions, additions, and substitutions may be made therein without departing from the spirit and scope of my invention, as set forth in the accompanying claims.

I claim as my invention:

1. A liquid fuel burning unit of the horizontal type having a resilient annular element at one end for sealing the unit to a cylindrical wall, spaced rubber blocks at the opposite end of the unit also engaging the cylinder wall for frictionally and removably mounting the unit therein while providing a passage for air between said blocks.

2. A liquid fuel burning unit of the horizontal type, including in combination, a motor, a hollow shaft for said motor, a fuel delivering nozzle on said shaft, a pump driven thereby, a hollow shaft in said pump, a regulating valve, means for introducing liquid from said pump to said valve and from said valve through said hollow pump shaft and from said pump shaft to4 said hollow motor shaft from which it is sprayed by said nozzle.

EDWARD L. WOOD. 

